Szabó János szerk.: Fragmenta Mineralogica Et Palaentologica 21. 2003. (Budapest, 2003)

than the Csehbánya 1. In the former, Asslilina, Alveolina, is especially varied). In the latter, the community of Orbitolites and Operculina are associated with the Nummulites, larger foraminifera consists essentially of Nummulites and represented by quite a number of taxa (the Alveolina fauna Assilina only. Figure 2 — Geographic extension and stratigraphie position of the Nummulites communities of the Lutetian Nummulites laevigatus Zone. Niimmiilites lorioliZone (Figure 3) — It is developed in the western half of the High Bakony only. To analyze its palaeocommunity, the borehole Csehbánya 1. was chosen, in the 146.2 to 148.2 m interval of which the palaeocommunity of this zone is the most typical in Hungary. From the limestone core a well-preserved medium-quantity fauna (abundance index = 3—4) was obtained. The medium-size, reticulate N. lorioli is the dominant taxon (60 %). Punctuate species (N. baconicus, N. uranensis, N. praeaturicus, ) make up 17 %, while the striates (N. variolarius, N. ^rcensis, N. dudarensis) 16 %. A new element is a small-size taxon of smooth Nummulites: N. millecaput "petit" (sensu SCHAUB). It is rather subordinate (3 %), its appearence forecasts, however, the forthcoming completion of the Nummulites fauna. Out of the taxa enumerated above, N. ^rcensis and N dudarensis are present in all palaeocommunities of the boreholes in this area. They are characteristic for the High Bakony. As far as the genera are concerned, the percentage of Nummulites is 84, that of Orbitolites 11. Other genera of larger foraminifera are absent, unlike the case of the N. laevigatus Zone in the High Bakony. The sporadic presence of the smaller foraminifera genus Miliolina (4 %) as well as that of coralline red algae is, howewer, worth of mention, since they are valuable ecological indicators. Bartonian palaeocommunities Nummulites perforatus 'Lone. (Figure 4) —This zone is illustrated by 4 palaeocommunities, one from each of the four Eocene facies regions of the Bakony Mountains. In the sample taken at 780.0 m from borehole Sv. 1. located at the westernmost margin of the Bakony Mountains, Nummulites occur in rock-forming quantity (abundance index = 5). The Nummulites fauna of the limestone core is of low diversity. The zone marker punctuate N. perforatus is by far the predominant species: 88 %. At first look it seems that the fauna is monospecific, consisting of 20—25 mm diameter specimens of JV. perforatus only. However, the detailed investigation has revealed the (scarce) presence of the other species as well: the striate N. variolarius, N. discorbinus, N. anomalus and N. millecaput (virtually its megaspheric generation only). These "accessorycal" taxa make up 2—5 % of the community.